Which of the following processes does not involve either oxidation or reduction ?

Formation of slaked lime from quick lime

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Heating mercuric oxide

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Formation of manganese chloride from manganese oxide

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Formation of zinc from zinc blende

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Solution

The correct option is A Formation of slaked lime from quick lime
Here, in this reaction
$C a O + H_{2} O \to C a (O H)_{2}$
oxidation number doesn't change so its not a redox reaction.

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